Mainak Sen cfb3723972 gpu: host1x: Add dma_fence_chain support ...

Enhance IOCTL handler to identify and
handle dma_fence_chain objects that might contain
host1x dma fences. This fixes issues
when userspace passes a dma_fence_chain
(created by DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT
operations) to HOST1X_IOCTL_FENCE_EXTRACT.

The updated code iteratively unwraps fence
chains until it finds a host1x_syncpt_fence or
reaches a fence it can't process. This ensures
proper operation with DRM-based applications
that use timeline syncobj features which internally
use dma_fence_chain.

Bug 4983872

Change-Id: I3eef9d54e2c42180cb5c74236cd64f42a863b7ea
Signed-off-by: Mainak Sen <msen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3364940
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Leslin Varghese <lvarghese@nvidia.com>
Tested-by: Arunmozhikannan Soundarapandian <asoundarapan@nvidia.com>
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>

2025-07-24 10:20:35 +00:00

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